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Vedasandūr, nestled in the Vellore district of Tamil Nadu, India, occupies a geographically significant position within the Kaveri basin. Located at approximately 10.5310° N latitude and 77.9502° E longitude, the town sits at an elevation of roughly 185 meters (607 feet) above sea level. The surrounding landscape is characterized by a mix of undulating terrain, transitioning from gently sloping plains to slightly more rugged hills in the distance, typical of the Deccan Plateau's fringes. The Palar River, a vital water source for the region, flows nearby, influencing local microclimates and agricultural practices. Vedasandūr’s proximity to the industrial belt around Sriperumbudur, a major manufacturing hub, is a crucial factor impacting its air quality. This belt houses numerous automotive, electronics, and textile industries, contributing to potential pollutant emissions. The urban-rural gradient around Vedasandūr is relatively sharp; the town itself is a small, primarily agricultural settlement, surrounded by predominantly rural areas dominated by paddy fields and plantations. This agricultural activity, while vital to the local economy, can contribute to seasonal particulate matter from crop burning and fertilizer use. The town’s location, shielded somewhat by the surrounding terrain, can also lead to localized air stagnation, particularly during periods of low wind speed, exacerbating the effects of nearby industrial pollution and agricultural emissions. The climate is tropical, with distinct wet and dry seasons, further influencing atmospheric conditions and pollutant dispersion.

Vedasandūr’s air quality follows a distinct seasonal pattern dictated by the region’s tropical climate and monsoon cycles. The southwest monsoon, typically arriving in June and lasting through September, brings significant rainfall, effectively cleansing the atmosphere and leading to a noticeable improvement in air quality. High rainfall washes away particulate matter and reduces the concentration of gaseous pollutants. Conversely, the pre-monsoon season (March-May) often witnesses a deterioration in air quality. Rising temperatures and decreasing rainfall create stable atmospheric conditions, promoting the build-up of pollutants. Temperature inversions, where a layer of warm air traps cooler air near the ground, are more frequent during this period, further hindering pollutant dispersion. Agricultural practices, including crop residue burning after the harvest season, contribute significantly to particulate matter pollution during these months. The post-monsoon season (October-November) is generally characterized by moderate air quality, with occasional dust storms and localized pollution events. Winter months (December-February) can experience periods of fog, which traps pollutants close to the ground, particularly in the mornings. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the pre-monsoon and winter months, limiting outdoor activities during peak pollution hours. Maintaining indoor air quality through ventilation and air purifiers is also advisable. The monsoon season offers the most favorable conditions for outdoor activities, providing a respite from elevated pollution levels.